Adding Wolfe line search algorithm and full BFGS search direction options.

Change-Id: I9d3fb117805bdfa5bc33613368f45ae8f10e0d79
diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index e9e5cef..9dfc80b 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -37,9 +37,6 @@
 ADD_EXECUTABLE(helloworld_analytic_diff helloworld_analytic_diff.cc)
 TARGET_LINK_LIBRARIES(helloworld_analytic_diff ceres)
 
-ADD_EXECUTABLE(powell powell.cc)
-TARGET_LINK_LIBRARIES(powell ceres)
-
 ADD_EXECUTABLE(curve_fitting curve_fitting.cc)
 TARGET_LINK_LIBRARIES(curve_fitting ceres)
 
@@ -55,6 +52,9 @@
 TARGET_LINK_LIBRARIES(simple_bundle_adjuster ceres)
 
 IF (GFLAGS)
+  ADD_EXECUTABLE(powell powell.cc)
+  TARGET_LINK_LIBRARIES(powell ceres)
+
   ADD_EXECUTABLE(nist nist.cc)
   TARGET_LINK_LIBRARIES(nist ceres)